Exercise mat



FIG. 1 is a perspective view of an exercise mat, showing my new design;

FIG. 2 is a top plan view of FIG. 1 thereof;

FIG. 3 is a bottom plan view of FIG. 1 thereof;

FIG. 4 is a front elevation view of FIG. 1 thereof, with the rear elevation view being a mirror image;

FIG. 5 is a left side elevation view of FIG. 1, with a right side elevation view being a mirror image; and,

FIG. 6 is another perspective view of FIG. 1 thereof, showing the exercise mat in use.

The broken lines depict environmental subject matter and form no part of the claimed design. 

CLAIM The ornamental design for an exercise mat, as shown and described. 